UmTRXv2 final project

Alexander Chemeris alexander.chemeris at gmail.com
Tue Jul 24 12:48:13 UTC 2012


Hi Jean-Samuel,

We're sitting together with Andrey Sviyazov now and he says that it's
fine to continue with this PCB.

You will need 40pcs of this 0 Ohm jumpers (2pcs per board):
http://fr.farnell.com/bourns/cr0603-j-000elf/resistor-0603-0r-5-0-1w/dp/2008343

Andrey will update the schematics and BoM later today.

On Tue, Jul 24, 2012 at 2:13 PM, Jean-Samuel Najnudel - BJT PARTNERS
SARL <jsn at bjtpartners.com> wrote:
> Hi Andrey,
>
> PCB copper is ready yet. We will lose 560 Euros and 3 weeks delay if we
> change the copper. It is not impossible, we can decide to do that but I
> would suggest we change the PCB for the next batch. After testing the v2
> board, you may found more changes we need on the copper.
>
> The board itself is not ready. We can change some passives. This will not
> cost anything (or almost) and extra delay will be just one or two days at
> most.
>
> Please let me know what you want to do about the PCB.
>
> Please let me know the exact passives modifications. I will purchase the
> components asap and send the modifications list to the fab.
>
> Best regards.
>
> Jean-Samuel.
> :-)
>
> Le 23 juil. 2012 22:47, "Andrey Sviyazov" <andreysviyaz at gmail.com> a écrit :
>
>> Hi Jean-Samuel.
>>
>> Please let me know fabrication progress, a specially PCB.
>> I ask you because of few changes required to improve LMS phase noises.
>> BOM required changes in passive components only.
>> If PCB doesn't yet ordered, then possible I'll make changes too.
>>
>> Best regards,
>> Andrey Sviyazov.
>> (Sent from my mobile client)
>>
>> 04.07.2012 20:01 пользователь "Jean-Samuel Najnudel - BJT PARTNERS SARL"
>> <jsn at bjtpartners.com> написал:
>>>
>>> Hi Andrey,
>>>
>>> Thank you very much for your help.
>>>
>>> I will forward this to the fab.
>>> Yes, you are all right, the FBMH2012HM121-T price is much better than the
>>> MLB-201209-0120PU. However, availability on Farnell France is not as good as
>>> the MLB-201209-0120PU. Price difference is quite big but we only use 5 beads
>>> per boards. Difference makes only about 1 euro per board. I will let the fab
>>> decide between these 2 references.
>>>
>>> Best regards.
>>>
>>> Jean-Samuel.
>>> :-)
>>>
>>>
>>> On Wed, Jul 4, 2012 at 4:30 PM, Andrey Sviyazov <andreysviyaz at gmail.com>
>>> wrote:
>>>>
>>>> Hi Jean-Samuel.
>>>>
>>>> Yes, you are all right and you can order TDK - MPZ1608S601A instead of
>>>> MLB-160808-0600PL.
>>>> And also possible to use 3 times cheaper FBMH2012HM121-T, 0805, 2.5A
>>>> instead of MLB-201209-0120PU.
>>>>
>>>> Best regards,
>>>> Andrey Sviyazov.
>>>>
>>>>
>>>>
>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com>
>>>>>
>>>>> Hi Andrey,
>>>>>
>>>>> Thank you very much for your reply.
>>>>> Now, I better understand.
>>>>>
>>>>> You are all right. I do not have anything as high current as
>>>>> MLB-201209-0120PU at a lower price.
>>>>>
>>>>> However, I have a 0603 600 ohm 1A bead, as MLB-160808-0600PL, at a much
>>>>> lower price.
>>>>>
>>>>> http://ru.farnell.com/tdk/mpz1608s601a/ferrite-bead-0603-600-ohm/dp/1669747RL
>>>>> What do you think about this component (TDK MPZ1608S601A)?
>>>>>
>>>>> Best regards.
>>>>>
>>>>> Jean-Samuel.
>>>>> :-)
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 4, 2012 at 3:22 PM, Andrey Sviyazov
>>>>> <andreysviyaz at gmail.com> wrote:
>>>>>>
>>>>>> Hi Jean-Samuel.
>>>>>>
>>>>>> If Farnell better for you, then please order exactly MLB-201209-0120PU
>>>>>> and  MLB-160808-0600PL.
>>>>>> They are HI_CURRENT beads and it is really required.
>>>>>>
>>>>>> Please find attached here new SCH and BOM files with new part numbers
>>>>>> and links.
>>>>>>
>>>>>> Best regards,
>>>>>> Andrey Sviyazov.
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL
>>>>>> <jsn at bjtpartners.com>
>>>>>>>
>>>>>>> Hi Andrey,
>>>>>>>
>>>>>>> Thank you very much for your reply.
>>>>>>>
>>>>>>> Could you please confirm the components bellow are fine ?
>>>>>>>
>>>>>>> http://fr.farnell.com/murata/blm18tg601tn1d/ferrite-600ohm/dp/1115050RL
>>>>>>>
>>>>>>> http://fr.farnell.com/tdk/mmz2012121b/perle-de-ferrite-0805-120-ohm/dp/1669728RL
>>>>>>>
>>>>>>> Please let me know if this is fine.
>>>>>>> If not, which would you suggest ?
>>>>>>> http://ru.farnell.com/ferrite-beads
>>>>>>>
>>>>>>>
>>>>>>> Thanks a lot for your help.
>>>>>>>
>>>>>>> Best regards.
>>>>>>>
>>>>>>> Jean-Samuel.
>>>>>>> :-)
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Jul 4, 2012 at 2:02 PM, Andrey Sviyazov
>>>>>>> <andreysviyaz at gmail.com> wrote:
>>>>>>>>
>>>>>>>> Hi Jean-Samuel.
>>>>>>>>
>>>>>>>> For the TI160808U601 and TI201209U121 you can use any high current
>>>>>>>> ferrite chip bead with 600 Ohm and 120 Ohm impedance respectively.
>>>>>>>> For example you could order similar partnumbers from the ELFA
>>>>>>>> catalogue in the 0603 and 0805 SMD cases respectively, datasheet here pdf.
>>>>>>>>
>>>>>>>> Best regards,
>>>>>>>> Andrey Sviyazov.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL
>>>>>>>> <jsn at bjtpartners.com>
>>>>>>>>>
>>>>>>>>> Hi Andrey,
>>>>>>>>>
>>>>>>>>> Thank you very much for your reply.
>>>>>>>>>
>>>>>>>>> I try to find where to buy the TI160808U601 and TI201209-121
>>>>>>>>> chokes. I do not know where I should find these. Would you know where I
>>>>>>>>> should order these components ?
>>>>>>>>>
>>>>>>>>> By the way, do you confirm the ISSI SRAM is pin compatible with the
>>>>>>>>> Cypress chip ?
>>>>>>>>>
>>>>>>>>> http://www.digikey.com/product-detail/en/IS61NLP51236-200TQLI/706-1103-ND/1557418
>>>>>>>>>
>>>>>>>>> Is this ISSI chip fine for our application ? Is 18 MBit enough ?
>>>>>>>>> Do you confirm this ISSI chip is the best value for what we need ?
>>>>>>>>> Are you sure we cannot find a lower cost chip with similar performances
>>>>>>>>> and/or a better performances chip with similar cost ?
>>>>>>>>> Are you sure we will not need to reroute the PCB ?
>>>>>>>>>
>>>>>>>>> We really need to be sure before starting the PCB production. If
>>>>>>>>> both you and Alexander confirm everything is fine, I will ask the fab to
>>>>>>>>> start the PCB.
>>>>>>>>>
>>>>>>>>> Please let me know.
>>>>>>>>>
>>>>>>>>> Again, thanks a lot for your help.
>>>>>>>>>
>>>>>>>>> Best regards.
>>>>>>>>>
>>>>>>>>> Jean-Samuel.
>>>>>>>>> :-)
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Tue, Jul 3, 2012 at 11:40 PM, Andrey Sviyazov
>>>>>>>>> <andreysviyaz at gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>> Jean-Samuel.
>>>>>>>>>>
>>>>>>>>>> Please inform me what actually rf chockes partnumbers are problem
>>>>>>>>>> to order.
>>>>>>>>>> Unfortunately MuRata produce few billion pcs and then stopped for
>>>>>>>>>> a few years.
>>>>>>>>>> So, possible we have to find some Chinese fab partnumbers to
>>>>>>>>>> order.
>>>>>>>>>>
>>>>>>>>>> Best regards,
>>>>>>>>>> Andrey Sviyazov.
>>>>>>>>>> (Sent from my mobile client)
>>>>>>>>>>
>>>>>>>>>> 04.07.2012 1:22 пользователь "Andrey Sviyazov"
>>>>>>>>>> <andreysviyaz at gmail.com> написал:
>>>>>>>>>>
>>>>>>>>>>> Hi Jean-Samuel.
>>>>>>>>>>> Unfortunately I have no internet connection now.
>>>>>>>>>>> Tomorrow I'll check flash and others.
>>>>>>>>>>>
>>>>>>>>>>> Best regards,
>>>>>>>>>>> Andrey Sviyazov.
>>>>>>>>>>> (Sent from my mobile client)
>>>>>>>>>>>
>>>>>>>>>>> 04.07.2012 1:10 пользователь "Alexander Chemeris"
>>>>>>>>>>> <alexander.chemeris at gmail.com> написал:
>>>>>>>>>>> >
>>>>>>>>>>> > On Mon, Jul 2, 2012 at 10:16 PM, Jean-Samuel Najnudel - BJT
>>>>>>>>>>> > PARTNERS
>>>>>>>>>>> > SARL <jsn at bjtpartners.com> wrote:
>>>>>>>>>>> > > 1/ Would you know a distributor for the Murata chokes ? The
>>>>>>>>>>> > > fab them to have
>>>>>>>>>>> > > some issue to source these.
>>>>>>>>>>> >
>>>>>>>>>>> > Andrey is looking into this.
>>>>>>>>>>> >
>>>>>>>>>>> > > 2/ Would you suggest a distributor for the GPS chip ?
>>>>>>>>>>> >
>>>>>>>>>>> > Try contacting manufacturer directly:
>>>>>>>>>>> >
>>>>>>>>>>> > http://www.transystem.com.tw/product.php?b=g&m=pe&cid=4&sid=&id=66
>>>>>>>>>>> >
>>>>>>>>>>> > They have a distributor in UK, but I think it might be easier
>>>>>>>>>>> > to buy
>>>>>>>>>>> > from the manufacturer directly:
>>>>>>>>>>> > http://www.castlemicrowave.com/castle-contact.asp
>>>>>>>>>>> >
>>>>>>>>>>> > This chip is popular in Russia, so it is easy to source them
>>>>>>>>>>> > here,
>>>>>>>>>>> > shipping them to EU might be a pain in big batches, but I think
>>>>>>>>>>> > we
>>>>>>>>>>> > could send few chips for this prototyping batch if
>>>>>>>>>>> > manufacturer's lead
>>>>>>>>>>> > time is too long. Here it costs $14.50/chip for more then 16
>>>>>>>>>>> > chips:
>>>>>>>>>>> > http://www.compel.ru/infosheet/TSI/EB-570/
>>>>>>>>>>> >
>>>>>>>>>>> > --
>>>>>>>>>>> > Regards,
>>>>>>>>>>> > Alexander Chemeris.
>>>>>>>>>>> > CEO, Fairwaves LLC / ООО УмРадио
>>>>>>>>>>> > http://fairwaves.ru
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru



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